This image or file is a work of an employee of the United States Federal Government, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image or file is in the public domain.

Generally speaking, works created by U.S. Government employees are not eligible for copyright protection in the United States. See Circular 1 "COPYRIGHT BASICS" PDF from the U.S. Copyright Office.

This image (or other media file) is in the public domain because its copyright has expired. This applies to the United States, where Works published prior to 1978 were copyright protected for a maximum of 75 years. See Circular 1 "COPYRIGHT BASICS" PDF. Works published before 1923, in this case c1899, are now in the public domain.

This image or file is a work of an employee of the United States Federal Government, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image or file is in the public domain.

This image (or other media file) is in the public domain because its copyright has expired. This applies to the United States, where Works published prior to 1978 were copyright protected for a maximum of 75 years. See Circular 1 "COPYRIGHT BASICS" PDF. Works published before 1923, in this case c1899, are now in the public domain.